Patent US3755989A successfully refreshed from Google Patents.
US3755989A
Expired / Lapsed
US
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Removal of mercury from gas streams
Assignee: Union Carbide Corp
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Filing: 1972-06-16
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Granted: 1973-09-04
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Expires: 1992-06-16
Abstract
Abstract Mercury vapor is removed from gas streams containing more than 60 percent relative humidity by raising the gas stream temperature to lower the relative humidity to less than 50 percent and thereafter selectively adsorbing the mercury vapor by passage through an activated carbon adsorbent bed under conditions such that water does not condense on the carbon adsorbent.
Inventors
- 👤 L Fornoff
- 👤 J Collins
- 👤 C Madigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:12
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/34; B01D53/46; B01D53/64; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/60; B01D2257/602; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40086; B01D2259/402
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
Process according to claim 1 wherein in step (2) the temperature of the gas stream is increased sufficiently to lower the relative humidity, to less than 40 percent.
Claim 2
Dependent Claim
18 words
Process according to claim 1 wherein thE gas stream being treated comprises hydrogen, mercury vapor and water vapor.
Claim 3
Dependent Claim
57 words
Process according to claim 1 wherein the bed regeneration of step (5) is accomplished by heat the bed and desorbing the mercury therefrom using a purge gas stream having essentially the same composition as the purified products gas stream of step (3), said purge gas stream being at a temperature of from about 500*F to about 750*F.
Claim 4
Dependent Claim
29 words
Process according to claim 1 wherein at least a portion of the mercury desorbed in regeneration step (5) is recycled and combined with the gas stream of step (1).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |